Wrist – Digit I, Wrist – Digit II, Wrist – Digit III, Wrist – Digit IV
Surface Recording Technique, Antidromic Study
The machine used was a Dantec Counterpoint electromyograph. Sensitivity, low-frequency filter, high-frequency filter, sweep speed, duration of pulse, and rate of pulse were not specified.
This study was performed in the supine position.
Following the antidromic method [ 1], signals were recorded using surface saline-soaked Velcro ring electrodes placed distally to the digits from the proximal stimulation of the median nerve (S) at the wrist. Sensory nerve action potentials (SNAPs) were recorded from digit I (Fig. 1), digit II (Fig. 2), digit III (Fig. 3), and digit IV (Fig. 4). Active ring (A) electrode was placed over the metacarpal (MCP) of digit I, digit II, digit III, and digit IV; the reference ring (R) electrode was placed on the distal (R) interphalangeal joint of the same digits. Every wrist–digit recording was made separately. A 10 cm distance between the recording and stimulating electrodes was used for wrist–digit I test, and a 13 cm...
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